Plunger metering pump leaking help
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This post was last edited by Haituan on 2020-8-21 12:44 Two newly installed plunger metering pumps with working pressures of 0.3~0.5MPa (in/out)； Flow rate 300~500L/h ； Now it appears continuously. When running for 3 to 5 hours, the machine seal becomes loose and leaks. It needs to be tightened. ； Such a high leakage frequency cannot meet the process design requirements. Please help me, where is the problem? Does the pump need to be replaced? Thank you guys: The vibration is large when the information is updated uniformly, and the outlet pressure gauge (mechanical gauge, gauge range 0~1MPa) can be damaged quickly. Medium: Dichloromethane maximum temperature: 90℃ Filling material: Tetrafluoroethylene------------------------------------------------------------------------------------------------ Editor's unified reply on August 21: The manufacturer came, and when I disassembled it, I found that the packing was installed backwards at the factory...:@ Now the plunger of one unit is worn, I will try again after the accessories are installed. Thanks for your replies.
The pressure of 3-5 kg is not high. This situation should be related to the geometric accuracy of the partial structure associated with the filler, and the other materials involved in friction. Some users change the packing seal to a skeleton oil seal type seal because they cannot tolerate leakage. According to a major chemical company, skeleton oil seals should be replaced at least once every six months. There is no need to replace the pump for the time being. Contact the manufacturer first. I believe it can be solved.
It should be a packing seal. Check to see if the packing material is inappropriate, corroded or worn too quickly, causing leakage.
It should be a packing seal. Check to see if the packing material is inappropriate, corroded or worn too quickly, causing leakage.
It is best to solve the problem of loose mechanical seal first. It's best to send a video to see if there are any installation issues. For reference.
Filling material problem? If the vibration is large, you can add two lock nuts behind the packing to prevent loosening.
The plunger metering pump is not equipped with a mechanical seal, but a sealing packing. According to the current situation, the packing is not compressed internally during installation. You can consider replacing the packing and tightening it.
If you need more information, such as medium, temperature, packing sealing form, packing material, etc., it is best to find the instruction manual and take a picture of the structure so that everyone can start analyzing
Plunger pumps are generally packed and sealed. It is best to attach a photo to see